A community pool offers two types of memberships: monthly and yearly. At the beginning of the year the ratio of monthly to yearly was 10:3. However the pool offered an incentive to have members change to the yearly membership. After the incentive the ratio was 5:8. If there were 59 monthly members after the incentive, then there were how many monthly members before the incentive?

Respuesta :

Answer:

There were 118 monthly members before the incentive

Step-by-step explanation:

Let the total number of incentive

Monthly membership after incentive = a

Yearly membership after incentive = b

a/b = 5/8

We are told in the question that: 59 monthly members after the incentive,

5/8 = 59/b

Cross Multiply

5b = 59 × 8

b = 59 × 8/5

b = 472/5

b = 94.4

Therefore, number of yearly members = 94.4

Total number of Membership after incentive

= 94.4 + 59

= 153.4

Note that total number of members before incentive = total number of members after incentive

From the question, At the beginning of the year the ratio of monthly to yearly was 10:3.

Monthly membership after incentive = a

Yearly membership after incentive = b

a/b = 10/3

10b = 3a

b = 3a/10

a + b = 153.4

a + 3a/10 = 153.4

10 × a + 3a × 1/ 10 = 153.4

10a + 3a = 10 × 153.4

13a = 1534

Divide both sides by 13

a = 1534/13

a = 118

Therefore, the number of members before monthly incentive = 118